Process for skin foam

Details Process for skin foam Process for skin foam

C - Chemistry, Metallurgy

08

J

18/646

C08J 9/34 (2006.01) B29C 44/04 (2006.01) B29C 44/22 (2006.01) B29C 47/00 (2006.01)

Patent

CA 1181209

Abstract of the Disclosure In the manufacture of skinned foam a technique for matching the viscosity of the skin as well as the foam so that both flow uniformly through the die includes the addition of blowing agent to all of the layers of the structure. To prevent foaming of the skin layers, nucleating agent is not added at those layers and the temperature is controlled so as to prevent nucleation without a nucleating agent. More specifically, the skins are kept above the boiling point of the blowing agent at atmospheric pressure and melt temperature, but below the temperature at which homogeneous nucleation occurs.

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